The Razer Kishi V2 is a good controller option for Android users looking for a Backbone-like controller with a mostly future-proofed design.
Razer Kishi v2 Review (for iOS) - New Discounted Price!
Review: Razer Kishi V2 refines the “gamepad that clamps to phone” concept
Razer Kishi Review - IGN
Razer Kishi V2 Review, Turn Your Android Phone Into A Nintendo Switch Like Hand-Held
Razer Kishi V2 review: Micro switches make all the difference
Razer Kishi V2 review: Micro switches make all the difference
Razer Kishi V2 Review: Android Game Controller Goes From Good to Great - CNET
Razer Kishi V2 vs GameSir X2 Pro - Overview, Comparison, and my Experience : r/EmulationOnAndroid
Razer Kishi V2 review: new design, frustrating problems - The Verge
Razer Kishi V2 Review - IGN